Screen

Pressing the INFO button with no reviewed image displays an overview of the current camera configuration, note that the EOS 40D provides two different info displays; Normal display and Shooting function display.

Focus

Unfortunately, the AI Focus can't tell the difference between subject movement and the photographer doing a focus-and-recompose, so you're usually better off picking Single or Servo and sticking with it.

Unfortunately, the AI Focus can't tell the difference between subject movement and the photographer doing a focus-and-recompose, so you're usually better off picking Single or Servo and sticking with it.

Lens

The 40D includes a dust spot deletion feature, whereby a photo of a plain white surface is used to create a mask to hide the effects of any persistent sensor dust spots, but it proved to be incapable of correcting the effects of the dust inside the lens.